Initializing help system before first use

XPRSloadpresolvebasis

Purpose
Loads a presolved basis from the user's areas.
Topic areas
Data Input, LP
Synopsis
int XPRS_CC XPRSloadpresolvebasis(XPRSprob prob, const int rowstat[], const int colstat[]);
Arguments
prob 
The current problem.
rowstat 
Integer array of length ROWS containing the basis status of the slack, surplus or artificial variable associated with each row. The status must be one of:
XPRS_NONBASIC_LOWER (0) 
slack, surplus or artificial is non-basic at lower bound;
XPRS_BASIC (1) 
slack, surplus or artificial is basic;
XPRS_NONBASIC_UPPER (2) 
slack or surplus is non-basic at upper bound.
colstat 
Integer array of length COLS containing the basis status of each of the columns in the matrix. The status must be one of:
XPRS_NONBASIC_LOWER (0) 
variable is non-basic at lower bound or superbasic at zero if the variable has no lower bound;
XPRS_BASIC (1) 
variable is basic;
XPRS_NONBASIC_UPPER (2) 
variable is at upper bound;
XPRS_SUPERBASIC (3) 
variable is super-basic.
Example
The following example saves the presolved basis for one problem, loading it into another: 
int rows, cols, *rowstat, *colstat;
...
XPRSreadprob(prob,"myprob","");
XPRSmipoptimize(prob,"l");
XPRSgetintattrib(prob,XPRS_ROWS,&rows);
XPRSgetintattrib(prob,XPRS_COLS,&cols);
rowstat = malloc(rows*sizeof(int));
colstat = malloc(cols*sizeof(int));
XPRSgetpresolvebasis(prob,rowstat,colstat);
XPRSreadprob(prob2,"myotherprob","");
XPRSmipoptimize(prob2,"l");
XPRSloadpresolvebasis(prob2,rowstat,colstat);
Related topics
XPRSgetbasis, XPRSgetpresolvebasis, XPRSloadbasis.

Parent Topic Console and Library Functions

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